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| All Patents in class 91/35 | |||||
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| Number | Date | Patentee | Title | Type | |
| 138,420 | Apr. 29, 1873 | O. Marland | Marine Steam-Engine Governors | steam engine governors | |
| 2,167,758 | Aug. 01, 1939 | W.M. Fairbairn, A.M. Johnson | Method and machine for honing cylindrical surfaces | honing machines | |
| 2,397,814 | Apr. 02, 1946 | H.J. Caldwell, S.F. Manning, E.Y. Seborg | Honing machine | honing machines | |
| 3,566,747 | Mar. 02, 1971 | C.W. Frame | Self-regulating expansion type control valve | drop hammers | |